<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>

<div id="app">
    <input type="text" v-model="msg">
    <br>
    正在输入：{{msg}}
</div>
<script>
    let vm = new Vue({
        el:'#app',
        data:{
            msg:'欢迎来到dap高级研发群'
        }
    })
</script>

</body>
</html>